A low-voltage circuit breaker is an electrical mechanical switch used to carry and break circuit current. According to the definition of the national standard GB14048.2, low-voltage circuit breakers can be divided into molded case circuit breakers and frame circuit breakers. Among them, the molded case circuit breaker refers to the circuit breaker whose shell is made of molded insulating material, and usually uses air as the arc extinguishing medium, so it is commonly called an automatic air switch.
An air circuit breaker refers to a circuit breaker whose contacts are opened and closed in air at atmospheric pressure. Unlike air switches, vacuum circuit breakers are implemented by opening and closing contacts in a high vacuum tube. It should be noted that although low-voltage molded case circuit breakers are often called automatic air switches, switches and circuit breakers are actually two different concepts.
Low-voltage circuit breakers are usually used to carry and break the current of the circuit, and can be divided into two types: molded case circuit breakers and frame circuit breakers. The molded case circuit breaker is also an air circuit breaker, using air as the arc extinguishing medium. Molded case circuit breakers generally have a smaller capacity and rated breaking current than frame circuit breakers, so they are protected by a plastic case. Frame circuit breakers have larger capacities and higher rated breaking currents, usually do not require plastic enclosures, and all components are mounted on a steel frame. In the case of short circuit or high current, the circuit breaker has good arc extinguishing ability and can automatically trip, so it is often used for operating electrical appliances such as power failure, power transmission, and switching on and off the load.
The selection of the air switch needs to be determined according to the actual situation. It is suggested that the following aspects should be considered when selecting the air switch:
1.Choose according to the maximum power consumption of the household to avoid frequent tripping due to the load exceeding the current.
2. Choose different short circuit breakers or air switches according to the power of different electrical appliances to avoid tripping due to excessive current at the moment of starting.
3.Select 1P leakage protectors in all branch circuits to improve the safety of electrical appliances.
4.Partitioning and branching, different areas can be divided according to floors or electrical appliances, which is convenient for management and maintenance. In general, the selection of the air switch needs to be carried out according to the actual situation. Specifically, the type, power, quantity and other factors of the electrical equipment should be considered to ensure the stability and safety of the power supply equipment.
In addition to the above points, the following factors should also be considered when purchasing an air switch: 6. Use environment: The rated current of the air breaker is also related to the temperature of the use environment. If the ambient temperature is high, the rated current of the air breaker will drop, so the air breaker should be selected according to the actual use environment. 7. Durability: The air switch is usually operated frequently, so it is necessary to choose a product with good quality and strong durability to avoid frequent replacement and maintenance. 8. Brand reputation: When purchasing air compressors, you should choose those brand products with high reputation and good reputation to ensure quality and after-sales service. 9. Brand consistency: Under the same electrical equipment configuration, it is recommended to use the same brand of air switch to avoid confusion and inconvenience during use and maintenance. 10. Convenience of installation and maintenance: When choosing an air switch, the convenience of installation and maintenance should a
Post time: Jul-06-2023